CN115448657A - Pervious concrete containing porous hybrid fiber modified recycled aggregate and preparation method thereof - Google Patents
Pervious concrete containing porous hybrid fiber modified recycled aggregate and preparation method thereof Download PDFInfo
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- CN115448657A CN115448657A CN202211023696.0A CN202211023696A CN115448657A CN 115448657 A CN115448657 A CN 115448657A CN 202211023696 A CN202211023696 A CN 202211023696A CN 115448657 A CN115448657 A CN 115448657A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/16—Waste materials; Refuse from building or ceramic industry
- C04B18/167—Recycled materials, i.e. waste materials reused in the production of the same materials
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/02—Treatment
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/02—Treatment
- C04B20/023—Chemical treatment
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00241—Physical properties of the materials not provided for elsewhere in C04B2111/00
- C04B2111/00284—Materials permeable to liquids
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
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- Civil Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
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- General Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses porous hybrid fiber modified recycled aggregate-containing pervious concrete which is characterized by comprising the following components in parts by weight: 1000-1200 parts of porous hybrid fiber modified recycled aggregate, 280-320 parts of cement, 90-100 parts of water, 300-320 parts of silica fume and 6.5-7 parts of water reducing agent; the preparation method of the porous hybrid fiber modified recycled aggregate comprises the following steps: dissolving polyacrylonitrile and polymethyl methacrylate in N, N-dimethylformamide, heating and stirring until the solid is dissolved to prepare spinning solution, preparing fibers by adopting an electrostatic spinning process, and sequentially carrying out pre-oxidation and high-temperature carbonization treatment on the fibers in a muffle furnace to prepare porous carbon fibers; mixing porous carbon fibers and graphene oxide dispersion liquid, carrying out ultrasonic treatment, adding recycled aggregate, carrying out stirring treatment, and then drying to obtain the graphene oxide/graphene composite material. The method provided by the invention is simple to operate, and the prepared concrete has good water permeability and good mechanical property.
Description
Technical Field
The invention relates to the technical field of building materials, in particular to pervious concrete containing porous hybrid fiber modified recycled aggregate and a preparation method thereof.
Background
In recent years, along with the rapid development of economy in China, urbanization is continuously deepened, and the demolition of old houses and the upgrade of public service facilities cause the accumulation of a large amount of construction wastes, so that the ecological environment is polluted, and certain resource waste is caused. In addition, the rapid development of economy leads people to increasingly increase the quality requirement of the living environment, more southern cities are troubled by urban waterlogging in summer, and the urbanization process cannot be met. The road surface of the sponge city not only needs to require high strength of the road surface, but also needs to consider the water permeability of the road surface, and the pervious concrete is widely applied to the construction of the road surface of the sponge city with proper strength and high permeability.
The pervious concrete comprises materials such as aggregate, cement, admixture, water and the like, and has a porous structure. Unlike common concrete, aggregate in pervious concrete is coarse aggregate, and cement-based cementing material is used as binder, so that a material with a framework-void structure is finally formed. The patent with the application number of 202110374372.0 provides a preparation method of ecological pervious concrete, which comprises a pervious concrete base layer, a pervious concrete surface layer and a surface layer, wherein the pervious concrete comprises the following raw materials in parts by weight: comprises 100 to 120 parts of aggregate, 50 to 100 parts of steel slag in metallurgical industry, 300 to 400 parts of cement, 10 to 15 parts of admixture, 3 to 10 parts of additive, 0.5 to 2 parts of toner and 40 to 50 parts of water. Application number 201811235531.3 provides a preparation method of recycled aggregate pervious concrete, which comprises the following steps: (1) Determining the gradation and the porosity of the recycled aggregate pervious concrete, wherein the porosity of the recycled aggregate pervious concrete is 25%; designing the mix proportion of the regenerated aggregate pervious concrete by a volume method, wherein the mix proportion is as follows: the weight ratio of the regenerated aggregate to the cement to the water is 130:150:34:36:16:19; (3) mixing the mixture by a secondary feeding method; (4) And forming by an inserting and smashing method to obtain the recycled aggregate pervious concrete. It is known from the prior art that the mechanical properties of concrete can be improved to a certain extent by adding fibers into pervious concrete, but the water permeability of concrete is affected by the addition of fibers.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: aiming at the defects in the prior art, the invention provides the pervious concrete containing the porous hybrid fiber modified recycled aggregate and the preparation method thereof.
In order to solve the technical problems, the technical scheme of the invention is as follows:
the permeable concrete containing the porous hybrid fiber modified recycled aggregate comprises the following components in parts by weight:
1000-1200 parts of porous hybrid fiber modified recycled aggregate, 280-320 parts of cement, 90-100 parts of water, 300-320 parts of silica fume and 6.5-7 parts of water reducing agent;
the preparation method of the porous hybrid fiber modified recycled aggregate comprises the following steps:
adding polyacrylonitrile and polymethyl methacrylate into N, N-dimethylformamide, heating and stirring until the solid is dissolved to prepare spinning solution, preparing fibers by adopting an electrostatic spinning process, and placing the fibers in a muffle furnace for sequentially carrying out pre-oxidation and high-temperature carbonization treatment to prepare porous carbon fibers; mixing porous carbon fibers and graphene oxide dispersion liquid, carrying out ultrasonic treatment, adding recycled aggregate, carrying out stirring treatment, and then drying to obtain the graphene oxide/graphene composite material.
Preferably, in the above technical solution, the mass ratio of polyacrylonitrile to polymethyl methacrylate is 7: (2-5).
Preferably, the electrostatic spinning process includes the following conditions: the distance between the nozzle and the receiving plate is 10-15cm, the spinning voltage is 15KV, and the spinning speed is 0.3-0.5ml/h.
Preferably, the pre-oxidation condition is that the temperature is firstly increased to 100 ℃ at the speed of 5 ℃/min for heat preservation treatment for 30min, and then the temperature is increased to 250 ℃ at the speed of 1 ℃/min for heat preservation treatment for 2h.
Preferably, the high-temperature carbonization treatment is carried out at 800 ℃ for 4-6h.
Preferably, the cement is P.O42.5 grade cement; the recycled aggregate is prepared by crushing and screening construction waste, the average particle size is 8-11mm, and the apparent density is 2523kg/m 3 The crush value was 15.33%, and the void ratio was 48.03%; the water reducing agent is polycarboxylate water reducing agent.
Preferably, in the above technical solution, the concentration of the graphene oxide dispersion liquid is 0.03 to 0.05%, and the mass ratio of the porous carbon fibers, the graphene oxide dispersion liquid, and the recycled aggregate is 3: (80-100): .
Preferably, the power of the ultrasonic treatment is 500-800W, and the time is 30-60min; the stirring speed of the stirring treatment is 1000-2000 r/min, and the time is 50-100min.
In order to better understand the invention, the invention also provides the following technical scheme:
a preparation method of pervious concrete containing porous hybrid fiber modified recycled aggregate comprises the following steps:
uniformly mixing and stirring the porous hybrid fiber modified recycled aggregate and the cement, adding water, continuously stirring, adding silica fume and a water reducing agent, uniformly mixing, placing in a mould for forming, then demoulding, and performing standard curing on the demoulded material to obtain the pervious concrete.
Preferably, the curing time is 28 days.
Due to the adoption of the technical scheme, the invention has the beneficial effects that:
the pervious concrete provided by the invention comprises porous hybrid fiber modified recycled aggregate, cement, water, silica fume and a water reducing agent, wherein the porous hybrid fiber modified recycled aggregate is prepared by hybridizing porous carbon fibers and graphene oxide and then modifying the recycled aggregate, the graphene oxide is high in strength and specific surface area, and oxygen-containing groups on the surface of the graphene oxide can participate in hydration reaction of the cement, so that the strength of the concrete is improved; the porous carbon fiber has large specific surface area, high strength and a porous structure, and can improve the mechanical property of the material and the water permeability of concrete when being added into a matrix; according to the invention, the prepared porous carbon fiber and the dispersion liquid of the graphene oxide are mixed, the porous carbon fiber enters between the sheets of the graphene oxide and then is mixed with the recycled aggregate, the porous carbon fiber and the graphene oxide have good dispersibility, and a framework is formed in the recycled aggregate, so that the mechanical property of the material is effectively improved.
Detailed Description
The invention is further illustrated by the following examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention.
Example 1
Dissolving 7g of polyacrylonitrile and 3g of polymethyl methacrylate in 100mlN, N-dimethylformamide, heating to 60 ℃, stirring until solids are dissolved to prepare spinning solution, and preparing fibers by adopting an electrostatic spinning process, wherein the distance between a nozzle and a receiving plate is controlled to be 10cm, the spinning voltage is 15KV, and the spinning speed is 0.3ml/h during electrostatic spinning; placing the prepared fiber in a muffle furnace, firstly heating to 100 ℃ at the speed of 5 ℃/min for preoxidation treatment for 30min, then heating to 250 ℃ at the speed of 1 ℃/min for preoxidation treatment for 2h, and then heating to 800 ℃ for high-temperature carbonization treatment for 4h to prepare porous carbon fiber; mixing 3g of porous carbon fiber and 80g of graphene oxide dispersion liquid with the concentration of 0.05% under 500W, performing ultrasonic treatment for 30min, then adding 80g of recycled aggregate, stirring at 1000 rpm for 100min, and then drying to obtain porous hybrid fiber modified recycled aggregate;
and (2) mixing and stirring 1000 parts of porous hybrid fiber modified recycled aggregate and 280 parts of cement uniformly, adding 90 parts of water, continuously stirring, adding 300 parts of silica fume and 6.5 parts of water reducing agent, uniformly mixing, placing in a mold for molding, demolding, and performing standard curing on the demolded material for 28 days to obtain the pervious concrete.
Example 2
Dissolving 7g of polyacrylonitrile and 5g of polymethyl methacrylate in 100mlN, N-dimethylformamide, heating to 60 ℃, stirring until solids are dissolved to prepare spinning solution, and preparing fibers by adopting an electrostatic spinning process, wherein the distance between a nozzle and a receiving plate is controlled to be 15cm, the spinning voltage is 15KV, and the spinning speed is 0.35ml/h during electrostatic spinning; placing the prepared fiber in a muffle furnace, firstly heating to 100 ℃ at the speed of 5 ℃/min for preoxidation treatment for 30min, then heating to 250 ℃ at the speed of 1 ℃/min for preoxidation treatment for 2h, and then heating to 800 ℃ for high-temperature carbonization treatment for 5h to prepare porous carbon fiber; mixing 3g of porous carbon fiber and 85g of graphene oxide dispersion liquid with the concentration of 0.05% under 600W, performing ultrasonic treatment for 30min, then adding 70g of recycled aggregate, stirring at 1500 rpm for 100min, and then drying to obtain porous hybrid fiber modified recycled aggregate;
1100 parts of porous hybrid fiber modified recycled aggregate and 290 parts of cement are uniformly mixed and stirred, 95 parts of water is added for continuous stirring treatment, 310 parts of silica fume and 6.5 parts of water reducing agent are added, the materials are uniformly mixed and placed in a mold for molding, then demolding is carried out, and the demolded materials are subjected to standard curing for 28 days to obtain the pervious concrete.
Example 3
Dissolving 7g of polyacrylonitrile and 4g of polymethyl methacrylate in 100mlN, N-dimethylformamide, heating to 60 ℃, stirring until solids are dissolved to prepare spinning solution, and preparing fibers by adopting an electrostatic spinning process, wherein the distance between a nozzle and a receiving plate is controlled to be 14cm during electrostatic spinning, the spinning voltage is 15KV, and the spinning speed is 0.4ml/h; placing the prepared fiber in a muffle furnace, firstly heating to 100 ℃ at the speed of 5 ℃/min for preoxidation treatment for 30min, then heating to 250 ℃ at the speed of 1 ℃/min for preoxidation treatment for 2h, and then heating to 800 ℃ for high-temperature carbonization treatment for 5h to prepare porous carbon fiber; mixing 3g of porous carbon fiber and 90g of graphene oxide dispersion liquid with the concentration of 0.05% under 700W, performing ultrasonic treatment for 50min, then adding 80g of recycled aggregate, stirring at 1500 rpm for 80min, and then drying to obtain porous hybrid fiber modified recycled aggregate;
according to parts by weight, 1200 parts of porous hybrid fiber modified recycled aggregate and 300 parts of cement are mixed and stirred uniformly, 95 parts of water is added for continuous stirring treatment, then 320 parts of silica fume and 7 parts of water reducing agent are added, the mixture is placed in a mold for molding after being mixed uniformly, then demolding is carried out, and the material after demolding is subjected to standard curing for 28 days, so that the pervious concrete is prepared.
Example 4
Dissolving 7g of polyacrylonitrile and 5g of polymethyl methacrylate in 100mlN, N-dimethylformamide, heating to 60 ℃, stirring until solids are dissolved to prepare spinning solution, and preparing fibers by adopting an electrostatic spinning process, wherein the distance between a nozzle and a receiving plate is controlled to be 10m during electrostatic spinning, the spinning voltage is 15KV, and the spinning speed is 0.3ml/h; placing the prepared fiber in a muffle furnace, firstly heating to 100 ℃ at the speed of 5 ℃/min for preoxidation treatment for 30min, then heating to 250 ℃ at the speed of 1 ℃/min for preoxidation treatment for 2h, and then heating to 800 ℃ for high-temperature carbonization treatment for 5h to prepare porous carbon fiber; mixing 3g of porous carbon fiber and 100g of graphene oxide dispersion liquid with the concentration of 0.05% under 800W, performing ultrasonic treatment for 30min, then adding 80g of recycled aggregate, stirring at 1000 rpm for 100min, and then drying to obtain porous hybrid fiber modified recycled aggregate;
according to parts by weight, 1200 parts of porous hybrid fiber modified recycled aggregate and 280 parts of cement are mixed and stirred uniformly, then 100 parts of water is added for continuous stirring treatment, then 300 parts of silica fume and 7 parts of water reducing agent are added, the mixture is placed in a mold for molding after being mixed uniformly, then demolding is carried out, and the material after demolding is subjected to standard curing for 28 days, so that the pervious concrete is prepared.
Example 5
Dissolving 7g of polyacrylonitrile and 3g of polymethyl methacrylate in 100mlN, N-dimethylformamide, heating to 60 ℃, stirring until solids are dissolved to prepare spinning solution, and preparing fibers by adopting an electrostatic spinning process, wherein the distance between a nozzle and a receiving plate is controlled to be 15cm during electrostatic spinning, the spinning voltage is 15KV, and the spinning speed is 0.5ml/h; placing the prepared fiber in a muffle furnace, firstly heating to 100 ℃ at the speed of 5 ℃/min for preoxidation treatment for 30min, then heating to 250 ℃ at the speed of 1 ℃/min for preoxidation treatment for 2h, and then heating to 800 ℃ for high-temperature carbonization treatment for 5h to prepare porous carbon fiber; mixing 3g of porous carbon fiber and 100g of graphene oxide dispersion liquid with the concentration of 0.05% under 500W, performing ultrasonic treatment for 60min, then adding 75g of recycled aggregate, stirring at 1500 rpm for 100min, and then drying to obtain porous hybrid fiber modified recycled aggregate;
according to parts by weight, 1200 parts of porous hybrid fiber modified recycled aggregate and 300 parts of cement are mixed and stirred uniformly, then 90 parts of water is added for continuous stirring treatment, then 300 parts of silica fume and 6.5 parts of water reducing agent are added, the mixture is placed in a mold for molding after being mixed uniformly, then demolding is carried out, and the demolded material is subjected to standard curing for 28 days to obtain the pervious concrete.
Comparative example 1
Mixing 100g of graphene oxide dispersion liquid with the concentration of 0.05% under 500W, performing ultrasonic treatment for 60min, then adding 78g of recycled aggregate, stirring at 1500 rpm for 100min, and then drying to obtain graphene oxide modified recycled aggregate;
according to the weight parts, 1200 parts of graphene oxide modified recycled aggregate and 300 parts of cement are mixed and stirred uniformly, then 90 parts of water are added for continuous stirring treatment, then 300 parts of silica fume and 6.5 parts of water reducing agent are added, the mixture is placed in a mold for molding after being mixed uniformly, then demolding is carried out, and the material after demolding is subjected to standard curing for 28 days, so that the pervious concrete is prepared.
Comparative example 2
Dissolving 7g of polyacrylonitrile and 3g of polymethyl methacrylate in 100mlN, N-dimethylformamide, heating to 60 ℃, stirring until solids are dissolved to prepare spinning solution, and preparing fibers by adopting an electrostatic spinning process, wherein the distance between a nozzle and a receiving plate is controlled to be 15cm during electrostatic spinning, the spinning voltage is 15KV, and the spinning speed is 0.5ml/h; placing the prepared fiber in a muffle furnace, firstly heating to 100 ℃ at the speed of 5 ℃/min for preoxidation treatment for 30min, then heating to 250 ℃ at the speed of 1 ℃/min for preoxidation treatment for 2h, and then heating to 800 ℃ for high-temperature carbonization treatment for 5h to prepare porous carbon fiber; mixing 3g of porous carbon fiber and 75g of recycled aggregate, stirring at 1500 rpm for 100min, and drying to obtain porous carbon fiber modified recycled aggregate;
according to parts by weight, 1200 parts of porous carbon fiber modified recycled aggregate and 300 parts of cement are mixed and stirred uniformly, then 90 parts of water are added for continuous stirring treatment, then 300 parts of silica fume and 6.5 parts of water reducing agent are added, the mixture is placed in a mold for molding after being mixed uniformly, then demolding is carried out, and the material after demolding is subjected to standard curing for 28 days, so that the pervious concrete is prepared.
The pervious concrete of the above examples and comparative examples was subjected to performance tests, and the test results are shown in table 1.
TABLE 1
| Compressive strength, MPa | Tensile strength at cleavage, MPa | Coefficient of water permeability, mm/s | |
| Example 1 | 39 | 7.3 | 5.25 |
| Example 2 | 41 | 7.5 | 5.27 |
| Example 3 | 40 | 7.3 | 5.25 |
| Example 4 | 40 | 7.2 | 5.22 |
| Example 5 | 40 | 7.5 | 5.25 |
| Comparative example 1 | 22 | 4.2 | 2.55 |
| Comparative example 2 | 19 | 3.9 | 3.25 |
From the test results, when the porous carbon fibers and the graphene oxide are compounded to modify the recycled aggregate, the mechanical property of the concrete can be well improved, and the water permeability of the concrete is also improved to a certain extent.
Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and such equivalents may fall within the scope of the present invention as defined in the appended claims.
Claims (10)
1. The pervious concrete containing porous hybrid fiber modified recycled aggregate is characterized by comprising the following components in parts by weight:
1000-1200 parts of porous hybrid fiber modified recycled aggregate, 280-320 parts of cement, 90-100 parts of water, 300-320 parts of silica fume and 6.5-7 parts of water reducing agent;
the preparation method of the porous hybrid fiber modified recycled aggregate comprises the following steps:
dissolving polyacrylonitrile and polymethyl methacrylate in N, N-dimethylformamide, heating and stirring until the solid is dissolved to prepare spinning solution, preparing fibers by adopting an electrostatic spinning process, and sequentially carrying out pre-oxidation and high-temperature carbonization treatment on the fibers in a muffle furnace to prepare porous carbon fibers; mixing porous carbon fibers and graphene oxide dispersion liquid, carrying out ultrasonic treatment, adding recycled aggregate, carrying out stirring treatment, and then drying to obtain the graphene oxide/graphene composite material.
2. The pervious concrete containing the porous hybrid fiber modified recycled aggregate of claim 1, wherein the mass ratio of polyacrylonitrile to polymethyl methacrylate is 7: (2-5).
3. The pervious concrete containing porous hybrid fiber modified recycled aggregate of claim 1, wherein the electrostatic spinning process conditions are as follows: the distance between the nozzle and the receiving plate is 10-15cm, the spinning voltage is 15KV, and the spinning speed is 0.3-0.5ml/h.
4. The pervious concrete containing the porous hybrid fiber modified recycled aggregate of claim 1, wherein the pre-oxidation condition is that the temperature is first raised to 100 ℃ at a rate of 5 ℃/min for 30min, and then raised to 250 ℃ at a rate of 1 ℃/min for 2h.
5. The pervious concrete containing the porous hybrid fiber modified recycled aggregate of claim 1, wherein the high-temperature carbonization treatment temperature is 800 ℃ and the time is 4-6h.
6. The pervious concrete containing the porous hybrid fiber-modified recycled aggregate of claim 1, wherein the cement is P.O42.5 grade cement; the recycled aggregate is prepared by crushing and screening construction waste, the average particle size of the recycled aggregate is 8-11mm, and the apparent density of the recycled aggregate is 2523kg/m 3 The crush value was 15.33%, and the void ratio was 48.03%; the water reducing agent is a polycarboxylate water reducing agent.
7. The pervious concrete containing the porous hybrid fiber modified recycled aggregate as claimed in claim 1, wherein the concentration of the graphene oxide dispersion liquid is 0.03-0.05%, and the mass ratio of the porous carbon fibers, the graphene oxide dispersion liquid and the recycled aggregate is 3: (80-100): .
8. The pervious concrete containing the porous hybrid fiber modified recycled aggregate of claim 1, wherein the power of ultrasonic treatment is 500-800W, and the time is 30-60min; the stirring speed of the stirring treatment is 1000-2000 rpm, and the time is 50-100min.
9. The preparation method of the pervious concrete containing the porous hybrid fiber modified recycled aggregate according to any one of claims 1 to 8, characterized by comprising the following steps:
uniformly mixing and stirring the porous hybrid fiber modified recycled aggregate and the cement, adding water, continuously stirring, adding silica fume and a water reducing agent, uniformly mixing, placing in a mould for forming, then demoulding, and performing standard curing on the demoulded material to obtain the pervious concrete.
10. The method for preparing the pervious concrete containing the porous hybrid fiber modified recycled aggregate according to claim 9, wherein the curing time is 28 days.
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